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Active distribution network differential protection method and system based on direct axis current

A direct-axis current, distribution network technology, applied in the field of active distribution network differential protection methods and systems, can solve the problems of inability to meet communication reliability and high speed, and do not consider RTDG differences, so as to alleviate the communication burden, Good reliability and sensitivity, easy to engineer effect

Active Publication Date: 2022-07-29
国网山东省电力公司聊城供电公司 +1
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

[0012] It can be seen that the inventors found that the existing active distribution network protection schemes do not consider the difference between RTDG and IIDG, are easily affected by the type and capacity of DG, and cannot meet the reliability and high-speed requirements of communication.

Method used

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  • Active distribution network differential protection method and system based on direct axis current
  • Active distribution network differential protection method and system based on direct axis current
  • Active distribution network differential protection method and system based on direct axis current

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0048] refer to Figure 5 , the direct-axis current-based differential protection method for an active distribution network in this embodiment includes the following steps:

[0049] S101: Obtain the three-phase current at both ends of the protected section.

[0050] S102 : After detecting the failure of the protected section, calculate the direct-axis current of each sampling point after the fault at both ends of the protected section, and exchange the information of each sampling point at both ends of the protected section.

[0051] In the specific implementation, the direct-axis current of each sampling point after the fault at both ends of the feeder is calculated by Parker transform.

[0052] Among them, the Parker transform does not require phase separation and phase information, which reduces the number of communication lines and the amount of transmission; the direct-axis current obtained by the Parker transform has a double frequency characteristic, and it only takes ...

Embodiment 2

[0099] A direct-axis current-based active distribution network differential protection system provided in this embodiment includes:

[0100] a current acquisition module, which is used to acquire the three-phase current at both ends of the protected section;

[0101] The direct-axis current calculation module is used to calculate the direct-axis current of each sampling point after the fault at both ends of the protected section after detecting the failure of the protected section, and exchange the information of each sampling point at both ends of the protected section;

[0102] Differential amount and braking amount calculation module, which is used to calculate the differential amount and braking amount of the corresponding sampling points at both ends of the protected section; where the differential amount is the sum of the direct axis currents at both ends of the protected section The absolute value of ; the braking amount is the product of the absolute value of the diffe...

Embodiment 3

[0106] This embodiment provides a computer-readable storage medium on which a computer program is stored, and when the program is executed by a processor, implements the direct-axis current-based differential protection method for an active distribution network described in the first embodiment above steps in .

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Abstract

The invention belongs to the technical field of active distribution network fault section location, and provides a direct-axis current-based differential protection method and system for an active distribution network. Among them, the active distribution network differential protection method based on direct-axis current includes acquiring the three-phase currents at both ends of the protected section; after detecting the fault of the protected section, calculating the respective samples after the fault at both ends of the protected section The direct-axis current of the point, and exchange the information of each sampling point at both ends of the protected section; calculate the differential momentum and braking amount of the corresponding sampling points at both ends of the protected section; where, the differential momentum is the two The absolute value of the sum of the direct-axis currents at the ends; the braking amount is the product of the absolute value of the difference between the direct-axis currents at both ends of the protected section and the braking coefficient multiplied; the differential momentum of all sampling points in one cycle is calculated The average value and the average value of the braking amount are used to determine the fault section according to the comparison result of the average value of the differential amount and the average value of the braking amount.

Description

technical field [0001] The invention belongs to the technical field of active distribution network fault section location, and in particular relates to a direct-axis current-based differential protection method and system for an active distribution network. Background technique [0002] The statements in this section merely provide background information related to the present invention and do not necessarily constitute prior art. [0003] The access of distributed power (DG) has changed the grid structure of the traditional distribution network. The traditional distribution network has changed from a radial network powered by a single-side power source to a radial network powered by a multi-terminal power source. The load current during normal operation and Short-circuit current after fault becomes bidirectional flow. The uncertainty of current magnitude and direction affects the operating characteristics of traditional distribution network protection schemes. [0004] Ac...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H02H3/28H02H1/00
CPCH02H3/28H02H1/0092
Inventor 孙良志任鹏飞臧琳冬邹贵彬蒋立潇李敬东闫昊于浩善陈芳
Owner 国网山东省电力公司聊城供电公司